Log uts information on launch of the session and relay daemon

To make debugging easier, log uts information on launch of the daemons.

Produces an output of the following form when the daemons are launched
in verbose mode:
  DBG1 - 14:30:14.997217006 [Main]: System information: (in log_system_information() at logging-utils.cpp:23)
  DBG1 - 14:30:14.997221139 [Main]: 	sysname: `Linux` (in log_system_information() at logging-utils.cpp:24)
  DBG1 - 14:30:14.997227199 [Main]: 	nodename: `carbonara` (in log_system_information() at logging-utils.cpp:25)
  DBG1 - 14:30:14.997231284 [Main]: 	release: `6.1.1-arch1-1` (in log_system_information() at logging-utils.cpp:26)
  DBG1 - 14:30:14.997235261 [Main]: 	version: `#1 SMP PREEMPT_DYNAMIC Wed, 21 Dec 2022 22:27:55 +0000` (in log_system_information() at logging-utils.cpp:27)
  DBG1 - 14:30:14.997240214 [Main]: 	machine: `x86_64` (in log_system_information() at logging-utils.cpp:28)

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I399fe8a88da8480e617cc33dd6b1dc2723c300c7